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APPENDIX

251

1.  With dilute aqueous or alcoholic caustic alkalis, or baryta,
or sulphuric acid, a ketonc is formed (ketonic decomposition),

ci i,..n >.ci i., coocyir, -i nao = ciuco.crr, + coa + caH5oi-i.

2.   Concentrated alcoholic potash decomposes the ester into
two molecules of acid (acid decomposition),

i:ii.,.co.cir,,.cooGjir, -i- 2ir.,o = CIL.COOII + CH,.COOH

'

If the alkyl derivatives of the ester arc employed, it is
possible to effect the synthesis of a scries of ketones and
saturated aliphatic acids, according to whether the one or other
reaction is used.

Of the other synthetic processes which have been studied in
connection with this substance, the following maybe mentioned :

i. The monoalkyl derivatives yield with nitrous acid the
isonitroso-dcrivative, from which the ortho-diketone may be
obtained (v. Pechmama),

ni.,.c<).c:ii(cn,,).cooG>iir, -i- UNO,,- CII.{.CO.C:(NOII).CH.>

+ 'GJIOOH + ii2o.

(MI;,C().C:(NOH).CII;{ -!~ II2O = CII.,.CO.CO.CII3 + NII2OII.

JJiacftyl.

These  compounds  readily condense,  forming   derivatives   of
quinonc,

()  i CO. C1I   II,,             CII,.C .CO . CII

!                                                "         =      ' I                                I    -

IToj.CO.C     O   .CII.,           CII.CO.CTLj

Dimetliyl (|ulnone.

ias and acetoacetic ester yield  pyricline

2. Aldehyde
derivatives (M

H

intxsch),

Nil

nil
o i

CII
CIL

II

Nil

crr,.c    ecu-.

C.CO.OC,H5

CoHr,O.CO.C
\/
CH
CHS
Dihydrocollidinedicarboxylic estsr.